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Grand County, Colorado — public water systems

At a glance

77 active public water systems are filed under Grand County, Colorado in EPA's SDWIS records, together reporting 56,067 people served. The largest is Winter Park Wsd, which reports serving 6,635 people. 24 are community water systems serving people where they live; the other 53 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

77

Population served

56.1K

Community systems

24

Groundwater share

89.6%

How does Grand County compare with other Colorado counties?

Grand County has the 8th-most active public water systems among the 113 counties listed for active Colorado systems in EPA records; among the 65 with 3 or more systems, the median has 18. Its systems report 56,067 people served in total, the 19th-largest county figure in the state and 0.7% of the statewide total. The average system here reports serving 728 people, well below the Colorado average of 3,400. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Grand County's drinking water come from?

By primary water source, Grand County's active systems draw on groundwater (61, 79%), groundwater under influence of surface water (7, 9.1%), surface water (6, 7.8%) and purchased surface water (2, 2.6%). Overall, 90% rely mainly on groundwater (including purchased groundwater) and 10% on surface water, compared with 74% and 26% across Colorado. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Winter Park Wsd, draws primarily on surface water.

What kinds of water systems operate in Grand County?

Grand County's active systems break down as 24 community systems (31%), 10 non-transient non-community systems (13%) and 43 transient non-community systems (56%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (60%), local government (22%) and federal government (18%).

The 50 largest water systems in Grand County

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Active public water systems in Grand County, Colorado
#Water systemCountyPopulation servedTypeSource
1Winter Park WsdGrand6,635CommunitySurface water
2Grand County Water No 1Grand5,400CommunitySurface water
3Winter Park Resort SunspotGrand5,006Transient non-communityGroundwater
4Winter Park Resort SnoasisGrand5,001Transient non-communityGroundwater
5Winter Park Resort Lunch RockGrand5,001Transient non-communityGroundwater
6Winter Park Ranch WsdGrand3,250CommunityGroundwater
7Granby Town of South Service AreaGrand2,300CommunityGroundwater under influence of surface water
8Fraser Town ofGrand2,150CommunityGroundwater
9Grand Lake Town ofGrand2,035CommunityGroundwater
10Granby Town of North Service AreaGrand2,025CommunitySurface water
11Kremmling Town ofGrand1,859CommunitySurface water
12Winter Park Resort Vasquez RidgeGrand999Transient non-communityGroundwater
13Stillwater CgGrand990Transient non-communityGroundwater
14Winter Park Resort DiscoveryGrand812Transient non-communityGroundwater
15Arapaho Bay CgGrand720Transient non-communityGroundwater
16Hot Sulphur Springs Town ofGrand687CommunitySurface water
17Green Ridge CgGrand624Transient non-communityGroundwater
18Young Life Crooked CreekGrand595Non-transient non-communityGroundwater
19Ymca Snow Mtn RanchGrand578CommunityGroundwater under influence of surface water
20Tabernash Meadows WsdGrand564CommunityGroundwater
21Smith Creek CrossingGrand518CommunityPurchased groundwater
22Blm Pumphouse Recreation SiteGrand500Transient non-communityGroundwater
23Pole Creek Golf ClubGrand490Non-transient non-communityGroundwater
24Devils Thumb Ranch ResortGrand451Non-transient non-communityGroundwater
25Columbine Lake WsdGrand428CommunityGroundwater
26Blue Valley MdGrand410CommunityGroundwater under influence of surface water
27North Shore WsdGrand378CommunityGroundwater
28Rmnp Headquarters WestGrand313Transient non-communityGroundwater
29Timber Creek CgGrand304Transient non-communityGroundwater
30Soda Springs WaGrand280CommunityGroundwater
31C Lazy U RanchGrand251Non-transient non-communityGroundwater under influence of surface water
32Lake Forest Mutual WcGrand250CommunityGroundwater
33Church of Eternal HillsGrand245Non-transient non-communityGroundwater
34Roadhouse Bar and GrillGrand204Transient non-communityGroundwater
35Granby Jones MHPGrand201CommunityGroundwater
36Sunset Point CgGrand200Transient non-communityGroundwater
37Arapaho Valley RanchGrand185Transient non-communityGroundwater
38Roadside TpGrand168Transient non-communityGroundwater
39Climax Molybdenum Co Henderson MillGrand165Non-transient non-communitySurface water
40Fraser Valley Sports ComplexGrand156Transient non-communityGroundwater
41Cutthroat Bay Group AreaGrand150Transient non-communityGroundwater
42Winding River Resort VillageGrand150Transient non-communityGroundwater
43River Ranch Village MHP LLCGrand140CommunityPurchased surface water
44Winter Park Christian ChurchGrand135Non-transient non-communityGroundwater
45The Shores of Shadow Mountain HoaGrand131Transient non-communityGroundwater
46T Lazy W MpGrand128Transient non-communityGroundwater
47Shadow Mountain VillageGrand115Non-transient non-communityGroundwater
48Wolford Mtn Recreation AreaGrand100Transient non-communityPurchased surface water
49Moraine Park WsGrand100CommunityGroundwater
50Chuck Wagon CafeGrand85Transient non-communityGroundwater

All other water systems in Grand County (26)

The remaining active systems filed under Grand County, largest first, with the population each reports serving.

Grand County water systems: frequently asked questions

How many public water systems are in Grand County, Colorado?

EPA's SDWIS records file 77 active public water systems under Grand County, Colorado: 24 community systems (31%), 10 non-transient non-community systems (13%) and 43 transient non-community systems (56%).

Who supplies drinking water in Grand County, CO?

The largest community water systems filed under Grand County are Winter Park Wsd (6,635 people served), Grand County Water No 1 (5,400 people served) and Winter Park Ranch Wsd (3,250 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.

Does Grand County's drinking water come from groundwater or surface water?

Of the 77 active public water systems in Grand County, 90% draw mainly on groundwater and 10% on surface water, counting purchased supplies. The largest system, Winter Park Wsd, uses surface water.

Where can I find a water quality report for Grand County?

Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 24 community systems are filed under Grand County, so the report to look for is the one from the system that supplies your address.

How can I check violations for a water system in Grand County?

Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.

More Colorado water systems

About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Public water systems in Grand County, Colorado”, https://aquacensus.com/water-systems/colorado/grand (data as of October 1, 2026).